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A. A. MARKS. Artificial Feet.

No. 234,596. Patented Nov. 16, I880..

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N.PETF.RS. FMOTOvUTHOGRAPHER, WASHINGTON. D C.

UNITED STATES AMASA A. MARKS, OF GREEN WIGH, CONNECTICUT.

ARTIFICIAL FEE'I'.

SPECIFICATION forming part` of Letters Patent No. 284,596, datedNovember 16, 1880.

Application filed September 29, 1880. (No model.)

To all whom it may concern:

Be it known that I, AMASA A. MARKs, a citizen of the United States,residing at Greenwich, in the county ot' Fairfield and State ofConnecticut, have invented new and useful Improvements in ArtificialFeet, ot' which the following is a specification.

This invention relates to certain improvements on the artificial limbswhich I have described in my Patent No. 40,763, dated December l, 1863;and my present invention consists in the combination, with an artificialfoot, of two or more Iiaps ot' canvas or other suitable textile'materialattached to the core ot' said foot, layers of rubber or other suitableelastic substance interposed between said flaps, and an envelope ot'rubber' inclosing the core and the iiaps, for the purpose of impartingsufficient elasticity to the toes to cause them to retain their normalposition, and to return to said position whenever they are free to doso.

This invention is illustrated in the accompanying drawings, in whichFigure 1 represents a longitudinal section of an artificial footconstructed according to my invention. Fig. 2 is a perspective viewofthe same.

Similar letters indicate corresponding parts.

In these drawings, the letter A designates the core of an artiiicialfoot, which is made of wood or any other suitable material. To the toeend of this core are secured two or more liaps, B, of canvas or othersuitable material, and between these flaps are placed layers C, otindia-rubber or other suitable material.

In the example represented by the drawings I have shown four iiaps, B,and the spaces between said iiaps are filled with soft and elasticindia-rubber, such as india-rubber sponge 5 but instead of using fourflaps lean apply only two, and place between them a piece of temperedsheet-steel cut to the required shape. The core A and the flaps Bareiinally inclosed in an envelope, D, of india rubber, as described in myPatent No. 40,7 63.

When the layers C are made o india-rubber I form and vulcanize them atthe same time with the envelope D, the iaps B being used to support andstrengthen the layers C.

By the combined action of the tlaps B and layers C sutiicientelasticityr is imparted to the toe part ot' the foot to retain the toesin their normal position, and to cause them to return to this positionwhenever they arefree to do so.

It is obvious that by interposing` between the iiaps B one or morelayers of elastic metal the same effect will be produced.

Nhat I claim as new, and desire to secure by Letters Patent, is-

Thecombination, with an artilicial foot, ot'two or more flaps ot' canvasor other suitable material attached to the core of said foot, layers ot'rubber or other suitable elastic substance iuterposed between saidiiaps, and an envelope of rubber inclosin g the core and the ilaps,substantially in the manner and for the purpose herein shown anddescribed.

In testimony whereof I have hereunto set my hand and seal in thepresence ot' two subscribin g witnesses.

AMASA A. MARKS. [L s] Witnesses:

W. HAUFF, E. F. KASTENHUBER.

